Test: Analog Electronics - 2 - Electrical Engineering (EE) MCQ

In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

In figure, voltage across R₂ = + 10 V. If V_BE = 0.7 V and V_E = 0.7 V and R_E = 10 kΩ, current through R_E is

A 12 kHz pulse wave-form is amplified by a circuit having an Upper cut-off frequency of 1 MHz. The minimum input pulse width that can be accurately reproduced is

Feedback factor may be less or more than 1.

An RC oscillator uses

The main advantage of CMOS circuit is

Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum

An ideal op-amp has zero slew rate.

In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

In a half wave diode rectifier circuit the current flows in the load circuit for

In a push pull circuit

A transistor with a = 0.9 and I_CBO = 10 μA is biased so that I_BQ = 90 μA. Then I_EQ will be

In figure, transistor β_dc = 100 and LED voltage when it is conducting is 2 V. Then the base current which saturates the transistor is

In figure the dc emitter current of each transistor is about

The input voltage for starting oscillations in an oscillator is caused by

The current flowing in a certain P-N junction at room temperature is 2 x 10^-7 Amp. When a large reverse biased voltage is applied. Calculate the current flowing when 0.1 volts is applied.

In following figure find V_DSQ by assuming gate current is negligible for the p-channel JFET. (if I_DQ = - 6 mA, R_S = 0, V_DD = -18 V, R_D = 2 kΩ, I_DSS = - 10 mA, I_PO = - 3 V)

Which of the following power amplifiers has highest efficiency?

A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions

Assume that op-amp in figure is ideal. If input V_i is triangular, the output V₀ will be

In an amplifier with a gain of - 1000 and feedback factor β = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be

In the diode circuit of figure the diodes are ideal. The average current through ammeter is